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package topology
import (
"encoding/json"
"errors"
"fmt"
"net/http"
"net/url"
"strconv"
"strings"
"github.com/chrislusf/seaweedfs/weed/glog"
"github.com/chrislusf/seaweedfs/weed/operation"
"github.com/chrislusf/seaweedfs/weed/security"
"github.com/chrislusf/seaweedfs/weed/storage"
"github.com/chrislusf/seaweedfs/weed/storage/needle"
"github.com/chrislusf/seaweedfs/weed/storage/types"
"github.com/chrislusf/seaweedfs/weed/util"
)
func ReplicatedWrite(masterNode string, s *storage.Store, volumeId needle.VolumeId, n *needle.Needle, r *http.Request) (isUnchanged bool, err error) {
//check JWT
jwt := security.GetJwt(r)
// check whether this is a replicated write request
var remoteLocations []operation.Location
if r.FormValue("type") != "replicate" {
// this is the initial request
remoteLocations, err = getWritableRemoteReplications(s, volumeId, masterNode)
if err != nil {
glog.V(0).Infoln(err)
return
}
}
// read fsync value
fsync := false
if r.FormValue("fsync") == "true" {
fsync = true
}
if s.GetVolume(volumeId) != nil {
isUnchanged, err = s.WriteVolumeNeedle(volumeId, n, fsync)
if err != nil {
err = fmt.Errorf("failed to write to local disk: %v", err)
glog.V(0).Infoln(err)
return
}
}
if len(remoteLocations) > 0 { //send to other replica locations
if err = distributedOperation(remoteLocations, s, func(location operation.Location) error {
u := url.URL{
Scheme: "http",
Host: location.Url,
Path: r.URL.Path,
}
q := url.Values{
"type": {"replicate"},
"ttl": {n.Ttl.String()},
}
if n.LastModified > 0 {
q.Set("ts", strconv.FormatUint(n.LastModified, 10))
}
if n.IsChunkedManifest() {
q.Set("cm", "true")
}
u.RawQuery = q.Encode()
pairMap := make(map[string]string)
if n.HasPairs() {
tmpMap := make(map[string]string)
err := json.Unmarshal(n.Pairs, &tmpMap)
if err != nil {
glog.V(0).Infoln("Unmarshal pairs error:", err)
}
for k, v := range tmpMap {
pairMap[needle.PairNamePrefix+k] = v
}
}
// volume server do not know about encryption
// TODO optimize here to compress data only once
_, err := operation.UploadData(u.String(), string(n.Name), false, n.Data, n.IsCompressed(), string(n.Mime), pairMap, jwt)
return err
}); err != nil {
err = fmt.Errorf("failed to write to replicas for volume %d: %v", volumeId, err)
glog.V(0).Infoln(err)
}
}
return
}
func ReplicatedDelete(masterNode string, store *storage.Store,
volumeId needle.VolumeId, n *needle.Needle,
r *http.Request) (size types.Size, err error) {
//check JWT
jwt := security.GetJwt(r)
var remoteLocations []operation.Location
if r.FormValue("type") != "replicate" {
remoteLocations, err = getWritableRemoteReplications(store, volumeId, masterNode)
if err != nil {
glog.V(0).Infoln(err)
return
}
}
size, err = store.DeleteVolumeNeedle(volumeId, n)
if err != nil {
glog.V(0).Infoln("delete error:", err)
return
}
if len(remoteLocations) > 0 { //send to other replica locations
if err = distributedOperation(remoteLocations, store, func(location operation.Location) error {
return util.Delete("http://"+location.Url+r.URL.Path+"?type=replicate", string(jwt))
}); err != nil {
size = 0
}
}
return
}
type DistributedOperationResult map[string]error
func (dr DistributedOperationResult) Error() error {
var errs []string
for k, v := range dr {
if v != nil {
errs = append(errs, fmt.Sprintf("[%s]: %v", k, v))
}
}
if len(errs) == 0 {
return nil
}
return errors.New(strings.Join(errs, "\n"))
}
type RemoteResult struct {
Host string
Error error
}
func distributedOperation(locations []operation.Location, store *storage.Store, op func(location operation.Location) error) error {
length := len(locations)
results := make(chan RemoteResult)
for _, location := range locations {
go func(location operation.Location, results chan RemoteResult) {
results <- RemoteResult{location.Url, op(location)}
}(location, results)
}
ret := DistributedOperationResult(make(map[string]error))
for i := 0; i < length; i++ {
result := <-results
ret[result.Host] = result.Error
}
return ret.Error()
}
func getWritableRemoteReplications(s *storage.Store, volumeId needle.VolumeId, masterNode string) (
remoteLocations []operation.Location, err error) {
v := s.GetVolume(volumeId)
if v != nil && v.ReplicaPlacement.GetCopyCount() == 1 {
return
}
// not on local store, or has replications
lookupResult, lookupErr := operation.Lookup(masterNode, volumeId.String())
if lookupErr == nil {
selfUrl := s.Ip + ":" + strconv.Itoa(s.Port)
for _, location := range lookupResult.Locations {
if location.Url != selfUrl {
remoteLocations = append(remoteLocations, location)
}
}
} else {
err = fmt.Errorf("failed to lookup for %d: %v", volumeId, lookupErr)
return
}
if v != nil {
// has one local and has remote replications
copyCount := v.ReplicaPlacement.GetCopyCount()
if len(lookupResult.Locations) < copyCount {
err = fmt.Errorf("replicating opetations [%d] is less than volume %d replication copy count [%d]",
len(lookupResult.Locations), volumeId, copyCount)
}
}
return
}
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